[xsl] Return value from a template...

I want to return a variable value from a template based on this example:
http://biglist.com/lists/xsl-list/archives/200205/msg01614.html
but it's not working...
Here's my code:
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0">
<xsl:output indent="yes" method="html" omit-xml-declaration="no"
encoding="ISO-8859-1" />
<xsl:param name="delimiter" select="','"/>

        <xsl:template match="/root">
        
                <xsl:variable name="idList">
                        <xsl:call-template select="/root/bib" name="getIdList" 
/>
                </xsl:variable>
                
                <xsl:value-of select="$idList"/>
                
        </xsl:template>
        

        <xsl:template match="/root/bib" name="getIdList">
                <xsl:for-each select="/root/bib">
                        <xsl:variable name="var"  select="concat($var,ids, 
$delimiter)"/>
                </xsl:for-each>
                <xsl:value-of select="$var"/>
        </xsl:template>

</xsl:stylesheet>

What's wrong in it?

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